JPH1136829A - Solenoid driven valve - Google Patents

Abstract

(57) Abstract: The present invention relates to an electromagnetically driven valve that constitutes an intake valve or an exhaust valve of an internal combustion engine, and supplies lubricating oil to a sliding portion that slides with opening and closing operations of a valve body. Aim. SOLUTION: A valve shaft 28 formed integrally with an intake valve 24.
Is held by the valve guide 30. An armature shaft for transmitting electromagnetic force is provided on the valve shaft. The armature shaft 36 is held by bearings 46 and 60. An oil passage 37 is formed inside the armature shaft 36. A suction hole 49 and a discharge hole 62 are provided near the upper end and the lower end of the armature shaft 36.
The bearing 46 is provided with an oil passage 48 and an annular groove 47 surrounding the armature shaft 36. A distribution path 50 communicating with the oil path 48 is provided. The lubricating oil is supplied from the oil gallery 54 to the distribution path 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetically driven valve, and more particularly to an electromagnetically driven valve suitable as an intake valve or an exhaust valve of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. Hei 7-30561
As disclosed in No. 2, an electromagnetically driven valve constituting an intake valve or an exhaust valve of an internal combustion engine is known. The conventional electromagnetically driven valve includes a valve shaft integrally formed with a valve body, and a valve guide that slidably holds the valve shaft. Further, the conventional electromagnetically driven valve includes an armature for transmitting electromagnetic force to the valve shaft, an armature shaft, and a bearing for slidably holding the armature shaft.

According to the above-mentioned conventional electromagnetically driven valve, an electromagnetic force for urging the valve body in the valve opening direction and an electromagnetic force for urging the valve body in the valve closing direction with respect to the armature alternately act. Thereby, the valve element can be repeatedly opened and closed. Therefore, according to the above-described conventional electromagnetically driven valve, the function as an intake valve and the function as an exhaust valve can be realized by controlling the electromagnetic force according to the motion state of the internal combustion engine.

[0004]

By the way, when the above-mentioned conventional electromagnetically driven valve is operated, a gap between a valve shaft and a valve guide is generated.
In addition, sliding friction occurs between the armature shaft and its bearing. Therefore, in order to operate the internal combustion engine smoothly, it is important to reduce the sliding friction.
However, in the above-mentioned conventional electromagnetically driven valve, no means is provided for suppressing sliding friction. In this regard, the structure of the conventional electromagnetically driven valve is not always optimal as a structure constituting an intake valve or an exhaust valve of an internal combustion engine.

[0005] The present invention has been made in view of the above points, and has as its object to provide an electromagnetically driven valve that supplies lubricating oil to a sliding portion that slides with opening and closing operations of a valve element. .

[0006]

The above object is achieved by the present invention.
As described in the above, an electromagnetically driven valve that includes a shaft member that transmits electromagnetic force to the valve body, and a bearing portion that slidably holds the shaft member, and that drives the valve body using electromagnetic force, The shaft member has an oil passage formed therein, and a discharge hole for discharging the lubricating oil supplied to the oil passage to the bearing portion, and supplies the lubricating oil to the oil passage of the shaft member This is achieved by an electromagnetically driven valve having a lubricating oil supply mechanism.

In the present invention, when the valve element repeats the opening and closing operations, sliding occurs between the shaft member and the bearing portion.
An oil passage and a discharge hole are formed in the shaft member. Lubricating oil is supplied to the oil passage from a lubricating oil supply mechanism. Further, the lubricating oil supplied to the oil passage is supplied to the bearing from the discharge hole. When the lubricating oil is supplied to the bearing portion as described above, the sliding friction accompanying the opening and closing operation of the valve body is reduced.

[0008] The object of the present invention is as described in claim 2.
2. The electromagnetically driven valve according to claim 1, wherein the lubricating oil supply mechanism is achieved by an electromagnetically driven valve that intermittently supplies lubricating oil to an oil passage of the shaft member. In the present invention, the lubricating oil for reducing the sliding friction associated with the opening / closing operation of the valve element is intermittently supplied. When lubricating oil is intermittently supplied, it is possible to prevent excessive lubricating oil from being supplied into the electromagnetically driven valve.

According to a third aspect of the present invention, in the electromagnetically driven valve according to any one of the first and second aspects, the lubricating oil supply mechanism includes a mist-like lubricating oil. This is also achieved by an electromagnetically driven valve that supplies
In the present invention, mist-like lubricating oil is supplied to the electromagnetically driven valve. By supplying the lubricating oil in the form of a mist, it is possible to prevent excessive lubricating oil from being supplied into the electromagnetically driven valve.

[0010]

FIG. 1 is a sectional view of a main part of an internal combustion engine 10 according to an embodiment of the present invention. The internal combustion engine 10
A cylinder head 12 is provided. Cylinder head 12
, An intake port 14 and an exhaust port 16 are formed. The intake port 14 and the exhaust port 16 communicate with a combustion chamber 18.

An electromagnetically driven valve 20 is mounted on the cylinder head 12.
And 22 are stored. The electromagnetically driven valve 20 includes an intake valve 24 that connects or disconnects the intake port 14 and the combustion chamber 18. On the other hand, the electromagnetically driven valve 22 is provided with an exhaust valve 26 for conducting or shutting off the exhaust port 16 and the combustion chamber 18.
It has. The electromagnetically driven valves 20 and 22 are connected to the intake valve 2
4 and the exhaust valve 26 have a similar configuration except that they have different diameters. Hereinafter, the structure and operation of the electromagnetically driven valve 20 will be described as typical examples thereof.

The electromagnetically driven valve 20 has a valve shaft 28.
The valve shaft 28 is provided integrally with the intake valve 24. A valve guide 30 that slidably holds the valve shaft 28 is fixed inside the cylinder head 12. Valve guide 3
A valve stem oil seal 31 is provided at the upper end of the zero. The valve stem oil seal 31 prevents the lubricating oil from flowing into the valve guide 30 excessively. A lower retainer 32 is fixed to an upper end of the valve shaft 28.

A lower spring 33 is provided below the lower retainer 32. The lower spring 33 urges the lower retainer 32 upward in FIG. Hereinafter, the space in which the lower spring 33 is provided is referred to as a lower spring chamber 34. The cylinder head 12 has a lubricating oil passage 35 communicating the lower spring chamber 34 with an oil reservoir (not shown).

The upper end of the valve shaft 28 is in contact with the armature shaft 36. The armature shaft 36 is a member made of a non-magnetic material. An oil passage 37 is formed at the center of the armature shaft 36. A plug 38 for closing the oil passage 37 is press-fitted into the upper part of the armature shaft 36. An armature 39 is fixed to the armature shaft 36. The armature 39 is an annular member made of a magnetic material. Hereinafter, the space in which the armature 39 is provided is referred to as an armature chamber 40.

Above the armature 39, a first electromagnetic core 41 is provided. The first electromagnetic core 41 includes an upper coil 42 and an upper core 43. The upper core 43 is an annular member made of a magnetic material. A core inner cylinder 44 is provided at the center of the upper core 43. Further, an upper plate 45 is disposed above the first electromagnetic core 41. A bearing 46 is provided at the center of the upper plate 45. Armature shaft 36
Is slidably held by a bearing 46 above the core inner cylinder 44. The clearance between the core inner cylinder 44 and the armature shaft 36 is set by the upper and lower bearings 46, 6.
Between the armature shafts so that they do not come into contact with each other.

FIG. 2 shows the bearing 46 and the armature shaft 3.
6 is an enlarged view of FIG. As shown in FIG. 2, the bearing 46 has an annular groove 47 and an oil passage 48. The annular groove 47 is formed on the inner peripheral surface of the bearing 46 so as to surround the armature shaft 36. The oil passage 48 has an annular groove 47 and a bearing 46.
Is formed so as to be electrically connected to the side surface. The armature shaft 36 is provided with a suction hole 49 communicating with the oil passage 37. The suction hole 49 is configured to be in communication with the annular groove 47 when the armature shaft 36 is located near the lower displacement end, that is, when the intake valve 24 is almost fully opened by the electromagnetically driven valve 20. Have been.

As shown in FIG. 1, a distribution passage 50 communicating with an oil passage 48 is formed in the upper plate 45.
At the end of the distribution channel 50, a plug 51 for closing the distribution channel 50 is press-fitted. In the upper plate 45,
One end of the pin ring 52 is inserted. Pin ring 5
The other end of 2 is pressed into cylinder head 12. An oil passage 53 communicating with the distribution passage 50 via a pin ring 52 is formed inside the cylinder head 12. The oil passages 53 are provided for each of the electromagnetically driven valves 20 included in the internal combustion engine 10. Cylinder head 1
An oil gallery 54 communicating with all the oil passages 53 is formed inside 2.

Below the armature 39, a second electromagnetic core 55 is provided. The second electromagnetic core 55 includes a lower coil 56 and a lower core 57. Lower core 57
Is an annular member made of a magnetic material. A core inner cylinder 58 is provided at the center of the lower core 57. Further, a lower plate 59 is provided below the second electromagnetic core 55. A bearing 60 is provided at the center of the lower plate 59. The armature shaft 36 is slidably held by a bearing 60 below the core inner cylinder 58.

The armature shaft 36 has a discharge hole 62 communicating with the oil passage 37. In FIG. 1, the intake valve 24 is maintained in a neutral state by the electromagnetically driven valve 20. As shown in FIG. 1, the discharge hole 62 is configured to be opened to the lower spring chamber 34 slightly below the bearing 60 when the intake valve 24 is in the neutral state.

A core guide 64 is provided around the outer core 43 and the lower core 57. Upper core 4
The relative position between the lower core 3 and the lower core 57 is maintained in an appropriate relationship by the core guide 64. A through hole 66 is provided on a side surface of the core guide 64. The position of the through hole 66 is set at a position where a part thereof slightly overlaps with the lower core 57.

In this embodiment, the axial direction of the electromagnetically driven valve 20 and the intake valve 24 is a predetermined angle θ from the vertical direction.
It is arranged so that it only inclines. For this reason, an inclination is formed on the upper end surface of the lower core 57 such that the center side of the internal combustion engine 10 is highest and the side surface of the internal combustion engine 10 is lowest. In this embodiment, the above-described through hole 66
The lower core 57 is provided on the side surface of the internal combustion engine 10 where the upper end surface is lowest.

A core guide 64 is provided on the cylinder head 12.
An oil passage 68 extending along the side surface of the oil passage 68 is provided. One end of the oil passage 68 opens to the upper end surface of the cylinder head 12. On the other hand, the other end of the oil passage 68 is connected to the lower spring chamber 3.
It communicates with 4. The oil passage 68 is provided on the side surface of the internal combustion engine 10 so as to open to the through hole 66. A through hole 70 is formed in the upper plate 45 so as not to cross the distribution path 50. The oil passage 68 of the cylinder head 12 communicates with the through hole 70 of the upper plate 45 at the upper end.

An upper cap 72 is provided above the upper plate 45. At the upper end of the upper cap 72, an adjuster bolt 74 and a lock nut 76 are provided.
Are arranged. In the lower part of the adjuster bolt 74,
An applicator 78 connected to the armature shaft 36 is provided. An upper spring 80 is provided between the adjuster bolt 74 and the retainer 78. Hereinafter, the space in which the upper spring 80 is provided is referred to as an upper spring chamber 81.

The upper spring 80 urges the retainer 78 and the armature shaft 36 downward in FIG. The neutral position of the armature 39 is adjusted by an adjuster bolt 74. In the present embodiment, the neutral position of the armature 39 is adjusted so as to be at the center of the first electromagnetic core 41 and the second electromagnetic core 55.

Hereinafter, the operation of the electromagnetically driven valve 20 will be described. When the exciting current is not supplied to the upper coil 42 and the lower coil 56, the armature 39 is in its neutral position, that is, the first electromagnetic core 41 and the second electromagnetic core 5
Maintained in the center of 5. When the excitation current starts to be supplied to the upper coil 42 in a state where the armature 39 is maintained at the neutral position, an electromagnetic force that draws the armature 39 toward the first electromagnetic core 41 is applied between the armature 39 and the first electromagnetic core 41. Occur.

Therefore, according to the electromagnetically driven valve 20, by supplying an appropriate exciting current to the upper coil 42, the armature 39, the armature shaft 36, the intake valve 24 and the like are displaced toward the first electromagnetic core 41. be able to. The armature shaft 36 can be displaced toward the first electromagnetic core 41 until the armature 39 contacts the upper core 43. The intake valve 24 closes the intake port 14 when the armature 39 contacts the upper core 43. Therefore, according to the electromagnetically driven valve 20, by supplying an appropriate excitation current to the upper coil 42, the intake valve 24 can be fully closed.

When the intake valve 24 is maintained in the fully closed state, the upper spring 80 and the lower spring 33
Urges the armature shaft 36 toward the neutral position. When the supply of the exciting current to the upper coil 42 is stopped in such a situation, the armature shaft 36 starts a single vibration operation according to the spring force of the upper spring 80 and the lower spring 33.

In the process in which the armature shaft 36 is displaced from the first electromagnetic core 41 side to the second electromagnetic core 55 side in accordance with the operation of the simple vibration, the armature shaft 36 and the bearings 46 and 60 and the valve shaft 28 Sliding occurs with the valve guide 30. According to the electromagnetically driven valve 20, the second electromagnetic core 55
By generating an electromagnetic force, the armature 39 compensates for the energy loss caused by the above-mentioned sliding, and the armature 39
The armature shaft 36 can be displaced until it comes into contact with the armature shaft 36.

The intake valve 24 is fully opened when the armature 39 comes into contact with the second electromagnetic core 55. Therefore, according to the electromagnetically driven valve 20, after the supply of the exciting current to the upper coil 42 is stopped, the lower coil 5
By starting the supply of the exciting current to 6, the intake valve 24 can be changed from the fully closed state to the fully open state with low power consumption.

When the supply of the exciting current to the lower coil 56 is stopped after the intake valve 24 is changed to the fully open state, the intake valve 24 starts to be displaced toward the fully closed position according to the operation of the simple vibration. Thereafter, at an appropriate timing, the upper coil 42
When the exciting current is repeatedly supplied to the lower coil 56, the intake valve 24 can be opened and closed with low power consumption.

As described above, during operation of the electromagnetically driven valve 20,
Sliding occurs between the armature 36 and the bearings 46 and 60, and between the valve shaft 28 and the valve guide 30. Therefore, in order to operate the electromagnetically driven valve 20 smoothly, it is important to reduce the sliding friction at the sliding portions. The electromagnetically driven valve 20 of this embodiment is characterized in that lubricating oil is supplied between the armature 36 and the bearings 46 and 60 and between the valve shaft 28 and the valve guide 30 in order to satisfy the above requirements. Have.

FIG. 3 shows a lubricating oil supply path for supplying lubricating oil to the sliding portion of the electromagnetically driven valve 20. In this embodiment,
The internal combustion engine 10 includes an air pump 82 and an oil atomizer 8.
4 is provided. The air pump 82 includes an oil atomizer 84
Supply high pressure air to The oil atomizer 82 atomizes the lubricating oil sucked from the suction hole with the high-pressure air supplied from the air pump 82, and discharges the mist-like lubricating oil from the discharge hole. The mist-like lubricating oil discharged from the oil atomizer 84 is supplied to the oil gallery 30 of the cylinder head 12.
Supplied to

The lubricating oil supplied to the oil gallery 30 is supplied to the electromagnetically driven valve 20 through an oil passage 53 and a distribution passage 50.
To the bearing 46. The lubricating oil that has reached the bearing 46 reaches the inner peripheral surface of the bearing 46 through the oil passage 48 and the annular groove 47. The lubricating oil that has reached the inner peripheral surface of the bearing 46 is supplied between the bearing 46 and the armature shaft 36 when the annular groove 47 and the suction hole 49 are not conductive.
As described above, the lubricating oil supplied between the bearing 46 and the armature shaft 36 has a function of suppressing the sliding friction between the bearing 46 and the armature shaft 36, and then leaks from above and below the bearing 46 and flows into the upper spring chamber. 81 and the armature chamber 40 (the path in FIG. 3).

The lubricating oil that has entered the upper spring chamber 81 reaches the lower spring chamber 34 through the through hole 70 and the oil passage 68 (path shown in FIG. 3). On the other hand, the lubricating oil that has entered the armature chamber 40 enters the oil passage 68 through the through hole 66, and then reaches the lower spring chamber 34 (path shown in FIG. 3). The lubricating oil that has reached the inner peripheral surface of the bearing 46 passes from the suction hole 49 to the oil passage 3 inside the armature shaft 36 when the annular groove 47 and the suction hole 49 are in conduction.
7, and reaches the discharge hole 62 at the lower end of the armature shaft 36 (path in FIG. 3). Therefore, in the electromagnetically driven valve 20, the mist-like lubricating oil is also supplied to the discharge hole 62.

The lubricating oil that has reached the discharge hole 62
When 2 is closed by the bearing 60, it is supplied between the armature shaft 36 and the bearing 60 (path in FIG. 3). Armature shaft 36 and bearing 60 as described above
After the lubricating oil supplied between them has a function of suppressing the sliding friction therebetween, it leaks from the lower part of the bearing 60 and enters the lower spring chamber 34 (path in FIG. 3). Further, the lubricating oil that has reached the discharge hole 62
In the case where 2 is opened to the lower spring chamber 34 below the bearing 60, it is discharged directly from the discharge hole 62 to the lower spring chamber 34 (path in FIG. 3).

In the electromagnetically driven valve 20, as described above,
Lubricating oil is supplied to the lower spring chamber 34 via various routes. Part of the lubricating oil supplied to the lower spring chamber 34 adheres around the valve shaft 28 and is supplied between the valve shaft 28 and the valve guide 30. At this time, the valve stem oil seal 31 prevents the lubricant oil from being excessively supplied between the valve shaft 28 and the valve guide 30 in order to prevent the lubricant oil from excessively entering the combustion chamber 18.

The lubricating oil supplied between the valve shaft 28 and the valve guide 30 has a function of suppressing sliding friction between the two, and then flows into the lubricating oil passage 35 together with the remaining lubricating oil. The lubricating oil flowing into the lubricating oil passage 35 is
After flowing into the oil reservoir 86, the oil is supplied to the circulation system again. As described above, according to the electromagnetically driven valve 20, the bearing 46
The lubricating oil is circulated so that the lubricating oil is appropriately supplied to the sliding portion between the armature shaft 36 and the bearing, the sliding portion between the bearing 60 and the armature shaft 36, and the sliding portion between the valve shaft 28 and the valve guide 30. Can be done.

FIG. 4 is a time chart showing the relationship between the operation of the electromagnetically driven valve 20 and the state of circulation of the lubricating oil. FIG.
(A) shows the opening and closing operation of the intake valve 24. As shown in FIG. 4A, the intake valve 24 repeats a fully open state and a fully closed state for each predetermined engine. In the internal combustion engine 10, the intake valve 24
Is performed twice every 720 ° CA. FIG. 4 (B)
Indicates a conduction state between the suction hole 49 of the armature shaft 36 and the annular groove 47 of the bearing 46. As described above, the suction hole 49
When the intake valve 24 has almost fully opened, the annular groove 47
And it is configured to conduct. Therefore, the suction hole 4
9 and the annular groove 47, as shown in FIG.
The conduction state is established substantially in synchronization with the timing when the stage 4 is fully opened.

FIG. 4C shows the timing when lubricating oil is supplied between the bearing 46 and the armature shaft 36. In the electromagnetically driven valve 20, lubricating oil is supplied between the bearing 46 and the armature 36 when the suction hole 49 and the annular groove 47 are shut off. Accordingly, as shown in FIG. 4C, the lubricating oil is (i) when the intake valve 24 is in the fully closed state, and (ii) when the intake valve 24 is in the fully closed state from the fully closed state or in the fully open state. At the time of displacement from
At the time when the sliding portion of the electromagnetically driven valve 20 slides,
It is supplied between the bearing 46 and the armature 36.

FIG. 4D shows an open state of the discharge hole 62 of the armature shaft 36. As described above, the discharge hole 62 is provided so as to be located slightly below the bearing 60 when the intake valve 24 is maintained at the neutral position. For this reason,
As shown in FIG. 4D, the discharge hole 62 is in an open state when the intake valve 24 is located at a position slightly deviated from a predetermined position near the neutral position to the fully open side.

FIG. 4E shows a timing when lubricating oil is supplied between the bearing 60 and the armature shaft 36. In the electromagnetically driven valve 20, lubricating oil is supplied between the bearing 60 and the armature 36 when the discharge hole 62 is closed by the bearing 60. Accordingly, as shown in FIG. 4 (E), the lubricating oil moves from (i) the time when the intake valve 24 is in the fully closed state, and (ii) from the fully closed state to the predetermined position near the neutral position. Or in the process of being displaced from a predetermined position near the neutral position toward the fully closed state.
And armature 36.

FIG. 4F shows the valve shaft 28 and the valve guide 3.
0 indicates the time when lubricating oil is supplied. In the electromagnetically driven valve 20, a part of the lubricating oil supplied directly from the discharge hole 62 to the lower spring chamber 34 and indirectly through the oil passage 68 between the valve shaft 28 and the valve guide 30. A part of the lubricating oil supplied to is supplied. Release hole 62
The time when the oil is supplied directly to the lower spring chamber 34 is limited to the time when the discharge hole 62 is opened to the lower spring chamber 34. On the other hand, lubricating oil always flows from the oil passage 68 into the lower spring chamber 34. For this reason, FIG.
As shown in (F), the lubricating oil is almost always directly or indirectly supplied between the valve shaft 28 and the valve guide 30.

As described above, according to the electromagnetically driven valve 20, when the intake valve 24 repeatedly opens and closes, the armature shaft 3
Lubricating oil can be appropriately supplied to the sliding portion between the bearing 6 and the bearings 46 and 60 and the sliding portion between the valve shaft 28 and the valve guide 30. Therefore, according to the electromagnetically driven valve 20, the intake valve 24 can be smoothly opened and closed with little power consumption without causing a large sliding loss.

In the electromagnetically driven valve 20, if the lubricating oil is excessively supplied from the oil gallery 54 to the oil passage 53, a large amount of the lubricating oil leaking from the bearings 46 and 60 may stay in the armature chamber 40. If a large amount of lubricating oil stays in the armature chamber 40, the displacement of the armature 39 may be hindered, and the electromagnetically driven valve 20 may not operate smoothly. Therefore, it is necessary to prevent the supply of excessive lubricating oil into the electromagnetically driven valve 20.

In the electromagnetically driven valve 20, if the diameters of the oil passage 53 and the distribution passage 50 are made sufficiently small, the amount of lubricating oil reaching the bearing 46 can be suppressed. However, oilway 5
In order to reduce the diameter of the distribution path 3 or the distribution path 50, fine machining such as electric discharge machining is required. In addition, the oil passage 53 and the distribution passage 5
When 0 is a small diameter, foreign substances and the like are easily clogged inside them. For this reason, in the electromagnetically driven valve 20, it is desirable to secure a certain diameter for the oil passage 53 and the distribution passage 50.

As described above, in this embodiment, mist-like lubricating oil is supplied to the electromagnetically driven valve 20. According to the method of supplying the lubricating oil in the form of a mist, the amount of the lubricating oil reaching the bearing 46 can be appropriately suppressed while securing a certain diameter in the oil passage 53 and the distribution passage 50. For this reason, according to the electromagnetically driven valve 20, it is possible to form an advantageous condition for preventing the lubricating oil from staying in the armature chamber 40 without causing inconveniences such as an increase in cost and a decrease in reliability.

As described above, in order to operate the electromagnetically driven valve 20 smoothly, the armature shaft 36 and the bearings 46 and 60 are required.
It is effective to supply lubricating oil to the sliding portion between the valve shaft 28 and the sliding portion between the valve shaft 28 and the valve guide 30. But,
In order to operate the electromagnetically driven valve 20 smoothly, it is not necessary to always supply lubricating oil to the above-mentioned sliding portion. In other words,
In order to prevent the lubricating oil from staying in the armature chamber 40 and to suppress the sliding friction of the sliding portion, it may be advantageous to intermittently supply the lubricating oil to the electromagnetically driven valve 20. From the above viewpoint, in this embodiment, the lubricating oil is intermittently supplied to the electromagnetically driven valve 20 only at a time necessary for smoothly operating the electromagnetically driven valve 20.

FIG. 5 shows a flowchart of an example of a control routine executed in the electromagnetically driven valve 20 to realize the above functions. The routine shown in FIG. 5 is a periodic interruption routine that is started every predetermined time. When the routine shown in FIG. 5 is started, first, the process of step 100 is executed. In step 100, it is determined whether or not the start of the internal combustion engine 10 has been started from the previous processing cycle to the current processing cycle. In order to operate the electromagnetically driven valve 20 smoothly, when the internal combustion engine 10 is started, the sliding portion between the armature shaft 36 and the bearings 46 and 60 and the sliding portion between the valve shaft 28 and the valve guide 30 are lubricated. It is appropriate to supply oil. Therefore, this step 10
When it is determined that the start of the internal combustion engine 10 has been started at 0, it can be determined that the supply of the lubricating oil should be started. In this case, the process of step 102 is executed next. On the other hand, if it is determined in step 100 that the start of the internal combustion engine 10 has not been started, step 102 is jumped, and the process of step 104 is executed.

In step 102, the lubricating oil supply time timer T is reset to "0". The lubricating oil supply time timer T is a timer for counting an elapsed time after the supply of the lubricating oil to the electromagnetically driven valve 20 is started. In step 104, it is determined whether or not the count value of the lubricating oil supply time timer T is equal to or shorter than a predetermined ON time T _ON . As a result, when it is determined that T ≦ T _ON holds, it can be determined that the _ON time T _ON has not yet elapsed after the lubricating oil supply time timer T is reset to “0”. In this case, the process of step 106 is performed next.

In step 106, a process for turning on the air pump 82 is executed. After the process of step 106 is executed, the oil atomizer 84 starts supplying mist-like lubricating oil to the oil gallery 54 thereafter. In step 108, the lubricating oil supply time timer T is incremented. When the process of step 108 ends, the current routine ends. According to the above-described processing, after the start of the internal combustion engine 10, the mist-like lubricating oil is supplied to the electromagnetically driven valve 20 until the lubricating oil supply time timer T counts a predetermined ON time T _0N. be able to.

In this routine, when it is determined in step 104 that the _count value of the lubricating oil supply time timer T has exceeded the predetermined on-time T _ON , that is, it is determined that T ≦ T _0N is not established. If so, the process of step 110 is executed next. In step 110, the air pump 11
A process of turning 0 off is executed. This step 11
When the process of 0 is executed, the supply of the lubricating oil from the oil atomizer 84 to the electromagnetically driven valve 20 is stopped thereafter.

In step 112, the engine speed NE of the internal combustion engine 10 is read. In step 114, the amount G of air taken into the internal combustion engine 10 is read. In step 116, a predetermined value α is calculated based on the engine speed NE and the intake air amount G. The predetermined value α increases as the engine speed NE increases, that is, as the sliding portion of the electromagnetically driven valve 20 slides at a high speed, and as the intake air amount G increases, that is, as the electromagnetically driven valve 20 increases. The higher the temperature of the sliding portion, the higher the value.

In step 118, a process for incrementing the lubricating oil supply time timer T by a predetermined value α is executed. According to the above-described processing, the lubricating oil supply time timer T can be increased with a steep gradient as the sliding portion of the electromagnetically driven valve 20 slides at a high speed and the temperature of the sliding portion is easily increased. . In step 120, whether the count value of the lubricating oil supply time timer T has reached the predetermined off time T _{0F F} is determined. As a result, if it is determined that T ≧ T _0FF is not satisfied, the current routine is terminated without any further processing. On the other hand, T ≧ T
If it is determined that _OFF is established, then step 12
2 is executed.

In step 122, the count value of the lubricating oil supply time timer T is reset to "0". This step 1
When the process of step S22 is executed, the current routine ends. When this routine is started again after the processing of step 122 is executed, the processing of step 106 via step 100 and step 104, that is,
A process for starting the supply of the lubricating oil is performed. Thereafter, the lubricating oil is intermittently supplied to the electromagnetically driven valve 20 continuously for a predetermined ON time T _{ON with} a predetermined _OFF time T _OFF as one cycle.

According to the above processing, after the start of the internal combustion engine 10, the lubricating oil can be intermittently supplied to the electromagnetically driven valve 20, and the lubricating oil can be supplied according to the motion state of the internal combustion engine 10. Further, the period during which the supply of the lubricating oil is stopped can be extended or shortened. Therefore, according to the electromagnetically driven valve 20, the sliding portion between the armature shaft 36 and the bearings 46 and 60, and the sliding portion between the valve shaft 28 and the valve guide 30 do not excessively stay the lubricating oil in the armature chamber 40. An appropriate amount of lubricating oil can be supplied to the sliding portion.

In the above embodiment, the armature shaft 36 and the valve shaft 28 are the "shaft member" according to the first aspect.
In addition, the bearings 46 and 60 correspond to the “bearing portion” of the first embodiment, and the oil passage 37 of the armature shaft 36 corresponds to the “oil passage” of the first embodiment, and the air pump 82 and the oil atomizer 8.
Reference numerals 4 correspond to the “lubricating oil supply mechanism” of the first aspect.

Next, an electromagnetically driven valve according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged view of the bearing 130 and the armature shaft 36 used in the electromagnetically driven valve of the present embodiment. The electromagnetically driven valve of this embodiment is
In the electromagnetically driven valve 20 shown in FIG. 1, this is realized by replacing the bearing 46 with the bearing 130.

The bearing 130 has an annular groove 132 and an oil passage 13.
4 is provided. The oil passage 134 communicates with the distribution passage 50 like the oil passage 48 of the bearing 46 in the first embodiment. The annular groove 132 is provided so as to surround the armature shaft 36 and open above the bearing 130. That is, in the electromagnetically driven valve of this embodiment, the annular groove 132 of the bearing 130 is open to the upper spring chamber 81 shown in FIG.

According to the structure of this embodiment, the armature shaft 3
When the suction hole 49 of No. 6 communicates with the annular groove 132, it is possible to prevent the mist-like lubricating oil in the oil passage 37 from being supplied while maintaining a high pressure. For this reason,
According to the electromagnetically driven valve of the present embodiment, a more advantageous situation can be formed in preventing the lubricating oil from being supplied excessively, as compared with the electromagnetically driven valve 20 of the first embodiment.

[0060]

As described above, according to the first aspect of the present invention, lubricating oil can be supplied to a portion where sliding occurs with the opening and closing operation of the valve element. According to the second and third aspects of the present invention, it is possible to prevent an excessive supply of lubricating oil to the inside of the electromagnetically driven valve.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an internal combustion engine equipped with an electromagnetically driven valve according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a bearing and an armature shaft provided in the electromagnetically driven valve shown in FIG.

FIG. 3 is a diagram showing a path for guiding lubricating oil to a sliding portion of the electromagnetically driven valve shown in FIG.

FIG. 4 is a time chart for explaining the operation of the electromagnetically driven valve shown in FIG. 1;

FIG. 5 is a flowchart of an example of a control routine executed in the electromagnetically driven valve shown in FIG.

FIG. 6 is an enlarged view of a bearing and an armature shaft provided in an electromagnetically driven valve according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 internal combustion engine 12 cylinder head 20, 22 electromagnetically driven valve 24 intake valve 26 exhaust valve 28 valve shaft 30 valve guide 36 armature shaft 37, 48, 53, 68 oil passage 41 first electromagnetic core 46, 60 bearing 47, 132 annular groove 49 suction hole 50 distribution path 55 second electromagnetic core 62 discharge hole 66, 70 through hole 82 air pump 84 oil atomizer

Claims (3)

[Claims] An electromagnetically driven valve comprising: a shaft member that transmits an electromagnetic force to a valve body; and a bearing portion that slidably holds the shaft member, wherein the electromagnetically driven valve drives the valve body using the electromagnetic force. The shaft member includes an oil passage formed therein, and a discharge hole for discharging the lubricating oil supplied to the oil passage to the bearing portion, and supplies the lubricating oil to the oil passage of the shaft member An electromagnetically driven valve comprising a lubricating oil supply mechanism. 2. The electromagnetically driven valve according to claim 1, wherein the lubricating oil supply mechanism intermittently supplies lubricating oil to an oil passage of the shaft member. 3. The electromagnetically driven valve according to claim 1, wherein the lubricating oil supply mechanism supplies mist-like lubricating oil.